Slack Sellers Back Saw , The Golden Guniea, I would of thought was the top of the pile (quality) back saw that they produced, although, I also own a couple of the Speed 52a, I would of thought, weight often denotes quality. I would say the Speed 52a was a heavier saw, does that in turn mean it is of better quality, I am not sure. I do not have any of the Slack Sellers tool catalogs to confirm any of my thoughts, if anyone can cast light on this, I would be very interested. I have heard that the range is again sub divided , by that I mean, the back saw range, also has:- Speed 52, Super Speed 52.